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A spring k=600N/m is placed in a vertical position with its lower end supported by a horizontal surface. A2 Kg block that is initially 0.40m above the upper end of the spring is dropped from rest onto the spring . What is the kinetic energy of the block at the instant it has fallen 0.50m (compressing the spring0.10m)?
A rescue helicopter lifts a 80.7-kg person straight up by means of a cable. Use the work-energy theorem and find the final speed of the person
The cooling circuit of an air conditioning system is a heat exchanger and the outside air passes. The air flow is 40 cubic meters / min, enters a40 ° C, 1.1bar, and exits at 20 ° C, 1 bar.The R-12 enters the tubes with a quality of 40% and 10 º C ..
The block in the figure oscillates sinusoidally between x = +a and x = %u2212a. The coordinate is x(t) = a cos(wt). Calculate the maximum speed
The donor paid gift tax of $14,000 on the transfer. If Laura later sells the property for $110,000, illustrate what is her recognized gain or loss?
Purchase new automated equipment that will change the proportion between variable and fixed costs to 40% variable and 60% fixed. Determine the selling price per unit. Calculate the break-even point in dollars for 2011.
When a metal is irradiated with 410-nm photons, the stopping potential is 1.2 eV. Find the cutoff wavelength (in nm) for this metal
A 17-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 32 N. Find the coefficient of kinetic friction between the runners of the sled and the snow
The ideal gas law relates the temperature, pressure and volume of an ideal gas. How many molecules of gas are inside the balloon
The warranty on a new tire says that an automobile can travel for adistance of 96 000 km before the tire wears out. The radius of thetire is 0.31 m. How many revolutions does the tire make beforewearing out?
Batman (mass = 102 kg) jumps straight down from a bridge into a boat (mass = 550 kg) in which a criminal is fleeing. What is the velocity of the boat after Batman lands in it
An electron is accelerated from rest by a potential difference of 440 V. It then enters a uniform magnetic field of magnitude 220 mT with its velocity perpendicular to the field. Calculate the radius of its path in the magnetic field
A playground carousel ("merry-go-round") is free to rotate frictionlessly in the horizontal plane (and air resistance is negligible). Find the person's mass
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